

MCQOPTIONS
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1. |
Mechanical pulse having an oscillation frequency in range of `_____________ |
A. | 30 kHz to 40 kHz |
B. | 40 kHz to 50 kHz |
C. | 50 kHz to 60 kHz |
D. | 60 kHz to 70 kHz |
Answer» C. 50 kHz to 60 kHz | |